#define BLYNK_TEMPLATE_ID "TMPL62g-vhitF"
#define BLYNK_TEMPLATE_NAME "Praktek IOT"
#define BLYNK_AUTH_TOKEN "VWTRC3NVieGaSyp28k50rmut8yJ29o0M"

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

const int trigpin = 21;
const int echopin = 5;
int mak =100;
int mini =10;

#define kecepatansuara 0.034


char auth[]="VWTRC3NVieGaSyp28k50rmut8yJ29o0M";
const char *ssid="Wokwi-GUEST";
const char *pass= "";

long durasi;
float jarak;

void setup() {
  Blynk.begin(auth,ssid,pass);
  {
    Serial.print(".");
    delay(500);
  }
  // put your setup code here, to run once:
  pinMode(trigpin, OUTPUT);
  pinMode(19, OUTPUT);
  pinMode(18, OUTPUT);
  pinMode(echopin, INPUT);
  Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  Blynk.run();
  digitalWrite(trigpin, LOW);
  delayMicroseconds(5);

  digitalWrite(trigpin, HIGH);
  delayMicroseconds(5);
  digitalWrite(trigpin, LOW);

  durasi=pulseIn(echopin,HIGH);
  jarak= (durasi * kecepatansuara)/2;
  Blynk.virtualWrite(V2,jarak);

  Serial.print("Jarak (cm) :");
  Serial.println((jarak));

  if (jarak < mini || jarak > mak ){
  digitalWrite(19, HIGH);
  digitalWrite(18, LOW);
  } else {
    digitalWrite(19, LOW);
    digitalWrite(18, HIGH);
  }
  delay(500);
}